Is the system working for changing a blog address?

I am trying to chang my blog address. I followed all the steps in the tutorial video, but instead of a "continue" button, there is a "review my changes" button. Each time I click on it it says the address must be all lower case letters and numbers only. I am already using all lowercase letters.

Yes,
I have tried several times. The tutorial video showed a continue button to click after the informatin is changed. But instead there is a "review my changes" button. When I click that is says I must use all lower case letters and numbers, but I am already doing that so there is nothing to correct.